By purchasing the DU-HA Replacement Box, you are able to install a DU-HA
storage unit in your truck and still use your Audiophile Subwoofer. In order
to use the DU-HA as a gun case, the Audiophile subwoofer must be removed
(easily interchangeable).

The original Audiophile subwoofer comes downfired from the factory. The
DU-HA replacement subwoofer box switches the speaker to the upfire position.